Power network directly exposed to natural conditions with wide geographic distribution.Meanwhile

electrical equipment are very sensitive to temperature

humidity

lightning and other weather conditions.Therefore

meteorological factors directly affect the security and stability of the grid.In this paper

firstly

the failure records of Beijing power grid between 1990 and 2009 are classified.Secondly

the fault causes and equipment types are analyzed and it is showed that meteorological factors account for 25% of power grid faults

and lightning strikes is the greatest impact on the overhead transmission line.Finally

the grid faults associated with the meteorological factors are analyzed.The annual distribution

monthly distribution and spatial distribution are presented by statistical methods.A variety of weather conditions on grid equipment including overhead transmission line

substation equipment

power cables and distribution network

are studied in detail.